Marigold scientific name Tagetes erecta L. Alias ​​honeycomb chrysanthemum, stinky chrysanthemum, stinky hibiscus. An annual herb of the Asteraceae family. Take medicine with flowers and roots. Detoxification, phlegm and cough, detoxification swelling function. All have cultivation in the country. Color version 1991587 The main symptoms are flowers, stems and leaves also occur. Flowering disease begins at the base of the petals, and the initial petals become brown and gradually wither, causing the petals to stretch slowly and become malformed. With the expansion of the disease, all the petals were infected and the buds rotted, causing the flowers to die. Stems and leaves infected with diseased leaves and petioles formed brownish to elliptical lesions that later spread into irregular shapes. Old lesions can produce black ascospora shells or conidia.
Pathogen Ascochyta chrysanthemi F. L. Stev. Two spores of Chrysanthemum are called semi-mycotic fungus. There are few conidiophores, hemispherical, brown, initially buried, quickly exposed, single or scattered, size 100-200μm, with neck, small orifice. Conidia are oblong, straight or irregular, 10-203-6.2 (μm) in size, blunt at the top, and often not clear at the diaphragm and do not contract. There is sex Mycosphaerella ligulicola K. F. Baker.
Transmission Pathogeny and Pathogenic Conditions The pathogens are mainly wintered by conidiospores or hyphae on diseased or diseased tissues, and have become the source of infestation at the beginning of the year. Conidia are mainly transmitted by rain splashing. The bacteria have high requirements for water and moisture conditions, so the temperature is high and it is rainy and the humidity is high.
Prevention methods (1) The diseased flowers were found to be removed in time after flowering, and were deeply buried or burned. (2) After flowering, start spraying 64% antivirus WP 400 to 500 times or 25% benomyl EC 800 times, 75% chlorothalonil wettable powder 600 times, every 10 days or so, control 3-4 times.
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